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 <dxl:Comment><![CDATA[
  Objective: Convert SubqueryAny to SubqueryExists while removing distinct from the subquery
create table foo(a int, b int);
create table bar(c int, d int);
explain
select * from bar where exists (select distinct a from foo)
union all
select * from bar where c in (select distinct a from foo)
union all
select * from bar where not exists (select distinct a from foo)
union all
select * from bar where c not in (select distinct a from foo);
                                                      QUERY PLAN
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Gather Motion 3:1  (slice6; segments: 3)  (cost=0.00..5296129.50 rows=1 width=8)
   ->  Append  (cost=0.00..5296129.50 rows=1 width=8)
         ->  Table Scan on bar  (cost=0.00..1324032.35 rows=1 width=8)
               Filter: (SubPlan 1)
               SubPlan 1  (slice6; segments: 3)
                 ->  Materialize  (cost=0.00..431.00 rows=1 width=4)
                       ->  Broadcast Motion 1:3  (slice2)  (cost=0.00..431.00 rows=3 width=4)
                             ->  Limit  (cost=0.00..431.00 rows=1 width=4)
                                   ->  Gather Motion 3:1  (slice1; segments: 3)  (cost=0.00..431.00 rows=1 width=4)
                                         ->  Limit  (cost=0.00..431.00 rows=1 width=4)
                                               ->  Table Scan on foo  (cost=0.00..431.00 rows=1 width=4)
         ->  Table Scan on bar bar_1  (cost=0.00..1324032.58 rows=1 width=8)
               Filter: (SubPlan 2)
               SubPlan 2  (slice6; segments: 3)
                 ->  Materialize  (cost=0.00..431.00 rows=1 width=4)
                       ->  Broadcast Motion 3:3  (slice3; segments: 3)  (cost=0.00..431.00 rows=1 width=4)
                             ->  Table Scan on foo foo_1  (cost=0.00..431.00 rows=1 width=4)
         ->  Table Scan on bar bar_2  (cost=0.00..1324032.19 rows=1 width=8)
               Filter: (SubPlan 3)
               SubPlan 3  (slice6; segments: 3)
                 ->  Materialize  (cost=0.00..431.00 rows=1 width=4)
                       ->  Broadcast Motion 3:3  (slice4; segments: 3)  (cost=0.00..431.00 rows=1 width=4)
                             ->  GroupAggregate  (cost=0.00..431.00 rows=1 width=4)
                                   Group Key: foo_2.a
                                   ->  Sort  (cost=0.00..431.00 rows=1 width=4)
                                         Sort Key: foo_2.a
                                         ->  Table Scan on foo foo_2  (cost=0.00..431.00 rows=1 width=4)
         ->  Table Scan on bar bar_3  (cost=0.00..1324032.37 rows=1 width=8)
               Filter: (SubPlan 4)
               SubPlan 4  (slice6; segments: 3)
                 ->  Result  (cost=0.00..431.00 rows=1 width=1)
                       ->  Result  (cost=0.00..431.00 rows=1 width=1)
                             Filter: ((CASE WHEN ((sum((CASE WHEN (bar_3.c = foo_3.a) THEN 1 ELSE 0 END))) IS NULL) THEN true WHEN ((sum((CASE WHEN (foo_3.a IS NULL) THEN 1 ELSE 0 END))) > 0::bigint) THEN NULL::boolean WHEN (bar_3.c IS NULL) THEN NULL::boolean WHEN ((sum((CASE WHEN (bar_3.c = foo_3.a) THEN 1 ELSE 0 END))) = 0::bigint) THEN true ELSE false END) = true)
                             ->  Result  (cost=0.00..431.00 rows=1 width=1)
                                   ->  Aggregate  (cost=0.00..431.00 rows=1 width=16)
                                         ->  Result  (cost=0.00..431.00 rows=1 width=8)
                                               ->  Materialize  (cost=0.00..431.00 rows=1 width=4)
                                                     ->  Broadcast Motion 3:3  (slice5; segments: 3)  (cost=0.00..431.00 rows=1 width=4)
                                                           ->  Table Scan on foo foo_3  (cost=0.00..431.00 rows=1 width=4)
  ]]>
  </dxl:Comment>
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            <dxl:Filter/>
            <dxl:SortingColumnList/>
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              <dxl:Properties>
                <dxl:Cost StartupCost="0" TotalCost="862.000596" Rows="1.000000" Width="8"/>
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              <dxl:ProjList>
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              </dxl:GatherMotion>
              <dxl:GatherMotion InputSegments="0,1,2" OutputSegments="-1">
                <dxl:Properties>
                  <dxl:Cost StartupCost="0" TotalCost="431.000073" Rows="1.000000" Width="4"/>
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                <dxl:Filter/>
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                  <dxl:Properties>
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                  <dxl:Filter/>
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                  </dxl:TableDescriptor>
                </dxl:TableScan>
              </dxl:GatherMotion>
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          </dxl:RandomMotion>
        </dxl:Append>
      </dxl:GatherMotion>
    </dxl:Plan>
  </dxl:Thread>
</dxl:DXLMessage>
